General Motors is building a prototype for a home hydrogen refueling unit in hope of selling fuel-cell cars by 2011. The automaker's goal is an affordable, compact unit that would allow customers to fill their cars overnight in their own garages, says GM spokesman Scott Fosgard.

Bank of America said Wednesday it will offer $3,000 rebates to thousands of employees who buy gas-electric hybrid vehicles, a move that could lead other large companies to provide similar "green" incentives.

Honda said Wednesday that it plans to introduce a small, inexpensive gas-electric hybrid car and new diesel-powered vehicles by 2009 in the latest indication of how automakers are responding to high gasoline prices.

Honda said Wednesday that it plans to build a new subcompact gas-electric hybrid car by 2009 and will market vehicles equipped with four-cylinder diesel engines in the latest indication of how automakers are responding to high gas prices.

While buyers are still hungry for cheaper gas-thrifty hybrid cars, some of the bigger models are sitting longer on sales lots. The smaller Toyota Prius and Honda Civic gas-electric hybrids remain hits that are in short supply.

The government has opened an investigation of the hot-selling hybrid Toyota Prius amid reports of the engine stalling without warning, officials said Wednesday. Toyota officials said last month they were investigating complaints about the Prius stalling.